diff --git a/configure.sh b/configure.sh
index 641076d..996da33 100755
--- a/configure.sh
+++ b/configure.sh
@@ -40,6 +40,7 @@ export LD_LIBRARY_PATH="\${QMCCHEM_PATH}/lib:\${LD_LIBRARY_PATH}"
 export LIBRARY_PATH="\${QMCCHEM_PATH}/lib:\${LIBRARY_PATH}"
 export QMCCHEM_MPIRUN="mpirun"
 export QMCCHEM_MPIRUN_FLAGS="--bind-to-core"
+export C_INCLUDE_PATH="\${QMCCHEM_PATH}/include:\${C_INCLUDE_PATH}"
 #export QMCCHEM_NIC=ib0
 source \${QMCCHEM_PATH}/irpf90/bin/irpman
 #source \${QMCCHEM_PATH}/EZFIO/Bash/ezfio.sh